Die-casting machine



June 2, 11925 15399@5 A. KAUFMANN DIE CASTING MAGHINE Fiied April 16, 1924 2 Sheets-Shee't 1 June 2 1925 I 1,539905 A. KAUFMANN DIE CASTING MACHINE Fi1ed April 16, 1924 2%Sheets-Sheet 2 Paenltenl June Z, 1925.,

NITED [ALBERT KAUFMANN, OF BERLIN, GERMANY.

DIE-CAS'IING MAGIE-EINE.

Application fi1ed April 10, 1924. Serial N0. 707,000.

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Be it known that I, ALBERT KAUFMANN, a citizen of Germany, and residing at 99 Kaisemlamm, Berlin, Germany, have invnted certain new and useful Improvements in Die-Casting Machines, of whicl1 the following is a specification.

This invention relates to die-casting macl1ines anal particularly to machines 0'f tl1is l incl in which the mold is moved by band to the outlet througl1 Wl1ich the metal is ejected from t-l1e crucible. In accordance with one feature of tl1e invention the mold, when rnovecl towarcls the meal ontlet, sfrikes against anarm 0r lever that causes tho clrive 0I" the p'nmp that ejects tl1e mefal m be. automaticnlly put into operation.

The drive 0f tl1e 1netal ejecting pump is flien automatically thrown olf after the drivingz slmft has tu1necl through a certain angle or l1as executed 21 completo revolution.

Another feature of the inventioi1 oonsists in providing a ooupling between the mechanisrn (hat Sets tl1e clrive in operation und die members tln1t control the said mechanism. This conpling has (0 be kept in itsadvantage tlmt the working stroke of thei pressure piston is not eflected ns in known machinos by spring power but positively by a cam monnte'd 0n the driving shaft, while the return stroke of the piston may 109 effeoted by a helical spring or a second cam.

T0 enable castings of various sizes to be mzule with one and the same cam the rorls whicl1 drive the pressure piston are providod with spring joints, the springs o-f whicli are compressed so as to permit the rods to expand when the mold is fille'd With nmtal und to thus enable the. cum 130 con tinue its rotation w'ithout dimiaging the said rods. Y f

The die-casting machine according to the invention is easy m operate und is capable of working at a higl1 speed. The machine cannotbe rlamaged by mistakes on the part 0f the operator and, while acting with 0ertainty, its construction is comparatively simple.

The invention is sl1own by way of' ex- -ample in the drawing in which -transverse section on the lirie VIVI.

Fig. 7 shows a part of the driving rods 0f the pressure piston on an enlarged scale sind Fig. 8 a 'section corresponding t0 Fig. 3 of a modifiecl die-oasting machine.

'llhe die-casting macl1ine consists oi a frame a, a crucible Z) with a furnace, a pressu1e cylinder c with a pressure piston (Z and a mold e, whicl1 latter is adapted to be n1oved, in a horizontal difection 0n tl1e frame a up t0 the metal outlet fat the side 0f the crncible. The mold is reciprocated in the nur chine illustrated by a rack ancl pinion drivo adaptecl t0 be operated by a handle g. The 1ecip10cation of the rr'xold inay, however. also be effected by other means. Mountecl in journals on thoframe a of tl1e machi'ne is a set of levers o1 links h. i, 70 aclaptecl to 700 turnecl'on a pivot l as shown in Fi,q. 1. The lever h is situatod in the path of tl1e mold e so that it is operated when the latter is m0ved to tl1e metal outlet f. VVhen tho lever h is'thus moveda short shaft m journalled in a bearing 0n the frame a is turned. Attachecl to the end of the shaft m is one half n 0f a clntoh, tl1e 0ther half 0 of Whicl1 is attached t0 the end 0f' a slmft 79 which is mounted to be. movecl axially in bemings a attached to tl1e frame of the. maohine. A spring q arranged at one end of the shaft p tends to tn1n tl1e shaft p into its normal rotary position and also t0 push it towards the left'. nally in the direction of the arrow r by means of a crank s and a pedal t. This shifting motion isfor the purpose of bringing the two halx' es n, 0 into engagement The shaft 79 is shifted longitudibelt pulley 2 and fixed on the shaft is a 001- lar 3 inwhich there is arranged a longitudinal movable coupling pin 4 which is shaped as shown in Fig. 6. This coupling pin has a recess in which tliere is a. spring 5 whose rear end abuts againsta fixed transverse abutment 6 and which tends to urge the pin 4 in the direction of the arrow 7. Normally the pin 4 is held in the position shown in Fig. 1 by the knife-shaped end 8 0f a double-a'rmed lever 9, 10 which enters the recess in the pin 4 as shown in Figs. 1 and 2. The leVer 9, 10 is pivotally mounted 011 the same stud y as the lever m. The

- hubs of the two levers m and 9, 10 have the form of ratchet-shaped clutcl1 members which are urged into engagement with each other by aspring 11 on tl1e stud y. The ratchet-sharied clutch members on the, hubs of the levers are arranged sothat when the lever w is turned in the direction of the arrow 12 (Fig. 4) the lever 9, 10 is carried round and swung up in the direction of the a'rrow 12 into the position shown in Fig. 5, in Wl1ieh the knife-shaped end 8 of the arm 9 is out of engagement with the pin 4.

spring 13 whose one exid is connected to the frame of the machine tends to keep the lever 9, 10 in the position shown in Fig. 4, i. e., it tends. to turn the lever 9, 10 in a. cqunt'er clockwise clirection.

The operat1on 0f flm coupling device Will vnow be described. The initialpositions of the mechanism are shown in Figs. 1, 2 und 4. When tl1e mold e is moved towards tl1e metal outlet and thus towards tl1e levcr h after the coupling n, 0 has bten thrown 011 by the depression 0f thepedal t tl1e levers h, z, 70 turn tl1e shaft p which then turns the crank 'v und through the oonnecting rod w d urns the lever m in the direction 0f the arrow 12. Consequently the lever 9, 10 is turned in the direction cf the arrow 12 am]. a coupling pin 4 is jerked by the spring 5 into a recess 14 in the hub of the continuously rotating pulley 2. The pnlley 2 is' thus coupled by the pin 4 t0 the collar 3 und as this collar is fixed 0n the shaft 2 the latter is turned so as to impart a rotary m0- tion to the cum 15 fixed on the shaft z.

The coupling pin 4 is returned f101nthe osition shown in Fig. 6 to its initial posi. tion shown in Figs. 1 and 2 so as to throw ofl' the drive when the driving shaft z has executed one revolution. This restoration of the coupling pin is efl'ected by means 0f a projection 16 attached to the collar 3, the projection being arranged t0 engage Wllll an oblique surface 0f an arm 17 attached t0 the hub 18 0f the lever z, when the collar 3 ha-s been turned through a certain angle. The projection 16, in brushing past the arm 17, thus shifts tl1e hub 18 with tl1e lever a: against the action of the spring 11, which results in the coupling between the two levers w and 9, 10 being released. Consequently the spring 13 returns the lever 9, 10 into the poSition shown in Fig. 4. The knife-shaped end 8 of thislever thus again enters the recess in the piri'4 between the rear end of the same and the abutment 6 (see Fig. 6) and the coupling pin 4 is pulled back into its initial position aga.inst the action of the spring 5 so as to release the coupling between the pulley 2 und the driving shaft z.

The mold i is now returned into the initial position shown in Fig. 1 and the casting remo ved from the same. The mold may then be again advanced to tl1e metal outlet t0 give rise to another series 0f operations similar to those already describecl.

Motion is transferred from tl1e cam 15 t0 the pressure piston d by the connecting rods 19 shoWn in Figs. 3 and 8 which are connected t0 a cross beam 20, the latter having a A to the upper cross bar 26. The cross br26 is attached t0 the pressure piston ormetl ejecting piston d. Springs 24 are arianged in the cylinders 23, the lower ends 0f the springs abutting against the bottoms of the cylinders 23 while the upper ends press against the pistons 22. A spring 27 inranged between the frame 0f the macl1inc und the Cross bar 26 tends to keep the piston d in i 'ts up1 ermostposition.

Wlien tl1e driving shalt 2 and tl1e cum 15 are turned in tlxe diriaction 0f the arrow 28 (Fig. 3) tl1e rods 19 with their pistons arev pulled downwards und the thrust of tl1e ders 24 transmits the pull of the rods 19 to the rods 25 which, by m'eans of the cross bar 26, press suddenly the piston d downWards against the action of the spring 27. The metal is thus ejected from the crucible into tl1e mold e until the latter is filled. Further downward motion 0f th e rods 19 Will naiv result in the compression of the springs 24, the piston d thus remaining stationary. When the cam 15 l1as almost executed a. complete revolution the downward pull 01T- the rods 19 ceases and the Spring 27 pulls tlfe rods with 'the piston d back int0 tl1eir initial positions in which the springs 24 will obtain perfect oastings.

again be expanded so that the pistons 22 Will be at the upper ends of he cylinders 23. lnstead of returning the pressure piston (Z into its initial position by a spring 27, this operation may be performed by a oam 29 arranged beside the cam 15 on the driving shaft 7 and oooperating with a cross beam 30 attached so the rods 19. The cam 29 is shaped so that it does not interfere With the downward motion of che pressure piston but raises the rods 19, and consequently the piston d, after the latter has executed its downward stroke. Arranged on one of the rods 25 is a projection 81 which engages With a lever 32 that aetuates a valve 33 so as to open the same. The valve 33 controls a pipe or conduit 34 which may be flexible and Which connects the mold e to a vaouum chamber so that when the valve 33 is opened air is drawn out of the mold e in order to Thus, at eaeh downward stroke of the piston d air is drawn out of the mold e.

1 claim: 1. Die-oast1ng maoh1ne, compr1s1ng a erncible W1lill an outlet f'or molten meial,

a mold holder adapted to he moved by band 0n sa1d arm, a ratchet sleeve engagmg With to' said outlet, means for ejecting metal from rhe cruo1ble through sa1d ontlet, a rofary shaft for operating said means, a drive for turning said shaft. motion transferring members for throwing the drive into connection with said shaft, a lever in the path of. said mold holder for actuating said mombers and rheans for automatically disconnecting said drive from said shaft when the latter has been tnrned through a certain angle.

2. Die-oasting machine, oomprising a erucible with an outlet for molten metal, a mold holder adapted to loe nioved by hand to said ontlet, means for ejecting metal fronx Ehe orncible throngh said ontlef, a rotary shaft for operating said means, a drive for tnrning said shaft, motion transferring members Tor throwinf; the drive into conneetion With said shaft, a lever in the path o'f said mold holder for actnating said n1em bers, a mannally operated elutoh for coupling said lever to said memhei*s, and means for antomatioally disconneoting said drive from said shaft When the latcer has been tnrned through a certain angle.

3. Die-casting maohine, oomprising a orueible with an ontlet for molten metal, a mold holder adapted to be movecl by hand to said outlet, means for ejecting 1netal from the erucible throngh said outlet, a rotary shaft for operating said means, a recessed collar fixed on said shait, a driving wheel loose on said shaft and having a recess in its hulo, a coupling pin slidable in the reevss of the oollar and positioned so as to loe able to enter the recess in said hnh. a spring tendin}; to move said pin into said hub, an arm for releasing said pin, motion transferring members for actnating said arm, a lever in the path of said mold holder for actuating said members, and amannally operated clntch for conpling said lever to said motion transferring members.

4. Die-casting machine, comprising anrucible with an ontlet for molten metal, a mold holder adapted to be moved by hand t0 said outlet, means for ejecting metal from the crucible through said outlet, a rotary shaft for operating said means, a collar fixed on said shaft and having 2Urecess extending parallel t0 the shaft, a driving wheel loose on said shaft and having a recess in its hub, a coupling pin slidable in the recess of the coll'ar and positioned so as to be able to move into the reoess in said hulo, a fixed .abutment, a spring lodged in the pin and pressing against said abutment and the pin so as to urge the latter towards said hub, a eheek formed in said pin, an

arm with a knife edge, a spring urging the said ratchet clutch and journalled on said pivot, a second shaft extending parallel to said driving shaft, actuating links for transferring motion from the second shaft to said ratchet sleeve, and a lever in the path of said mold holder for trning said second shaft and thus moving said arm away fro1n said pin{whereby the pin is caused to couple the driving shaft to the driving wheel.

5. Die-oasting machine, comprising a cru cible with an outlet for molten metal, a mold holder adapted to be moved by band to said outlet means for ejecting ineial from the cruoible through said ontlet a rotary' shaft for operatling said means, a collar fixed on said shaftand having a recess extending parallel to the shafi), a driving wheel loose. on said shaft and having a recess in its hub. a coupling pin slidalole in the recoss of the collar and positioned so as fo he able to move into the recess in said ln1b a fixed abutment, a spring lodged in the pin and pressing against said abntment and the pin so as to urge the latter towards said hnb, a cheek formed in said pin, an arm with a knife edge, a spring nrging ihe arm towards said pin and normally holding it botween said cheek and said abutment against the. action of the pin actnating spring, a pivot for said arm,-a ratchet clutch on said arm. a ratchet sleeve engaging with said ratchet clutch and jonrnalled on said pivot, a second shaft exfending parallel 130 said driving shaft, actuating links for transferring motion from the second shaft to said rafrhet sleeve, a lever in the path of said mold holder for turning said second shaft and thus moving said arm away from said pin, whereby the pin is caused to couple the driving shaft to the driving wheel, a p-rojeotion that rotates With said collar, a cam on said ratchet sleeve in path of said projection for moving the ratchet sleeve oufiof engagoment with ratchet clutch whereby the knife edge of said arm is permitted to be forced by its said spring between said abutment and eheek to remove the co'upling pin from the recess in the hulo of the driving wheel.

6. Die-casting machine comprising a erucible Witl1 an outlet for molten metal, a mold holder adaptecl to' be moved loy hand to said outlet, a piston for ejeoting the metal through said outlet, a driving shaft, a 001- lar fixed on said shaft ancl having a recess extencling parallel to the shaft, a drivin'g wheel loose on said shaft and liaving a recess in its hub, a coupling' pin slidable in the recess of the collar and positioned so as to be alo1e tomove into the recess in said hob, a fixed abutment, a spring loclged in the pin and pressing against said abtment and the pin so as to urge the latter towards said hub, a cheek formed in said pin, an arm with a knife edge, a spring urging the arm towards said pin and normally holding it between said cheek and said aloutment against the action of tl1e pin actuating spring, a pivot for said arm, a ratchet clutoh on said arm, a ratchet sleeve engaging with said ratchet olutch and journallecl on said pivot, a seoondshaft extending parallel to said driving shaft, aotuating links for transferring motion from the seoond shaft co said rafichet sleeve, a lever in the path of said mold holder for turning said second shaft and thus moving said arm away from said pin, whereloy a pin is caused to couple the driving shaft to the driving wheel, a carn on the driving shaft for operating saidpiston, and means for resforing the piston to its. non-operative position. 7. Diecasting ma ohine oorriprising a erncible with an outlet formolten metal, a molcl holder adapted to be moved by band to said o1itlet, a piston for ejecting ehe metal through said ouclet, a driving shaft, a 001- lar fixed on said shaft ancl having a 1ecess extending parallel to the shaft, a driving wheel loose 011 said shaft and having a recess in its hub, a coupling pin slidable in the reeess of the collar and positioned so as to be able to move into the recess in said hub, a fixed abutment, a spring lodged in the pin and pressing against said abutment and the pin so s to arge fhe latter towards said hub, a cheek formed in said pin, anarm With a knife edge, a spring urging the arm towarcls said pin and normally holding it between said cheek and said abutment' against the aotion of the pin actuating spring, a piv- 0t for said arm, a ratchet clutoh 011 said arm, a -ratchet sleeve engaging wi th said ratchet clutch and journalled on said pivot, a secon l shaft extending parallel to said clriving shaft, actuating links for transferring motion from the second shaft to said ratchet sleeve, a lever in the path of said mold holder for turning said seeond shaft and rhus movto its non-operative position.

8. Die-oasting machine comprising a erucible with an outlet for molten metal, a mold holder adapted to be moved by hand to said outlet, a piston for ejecting the metal through said outlet, a driving shaft, a C01- lar fixed on said shaft and having a recess extencling parallel. to the shaft, a driving wheel loose on saidshaft and having a recess in its hulo, a coupling pin slidable in the recess of the collar ancl positioned so as to be able to move into the reoess in said hub, a fixed abutment, a spring lodged in the pin and pressing against said abutment and the pin so as 130 urge the latter towards said hub, a cheek formed in said pin, an arm With a knife edge, a spring nrging the arm towards said pin an cl normally holding it between said oheek and said abutmenn against the aotion of the pin actuating spring, a pivot for said arm,'a ratohet clutoh on said arm, a ratchet sleeve engaging Witl1 Saifl ratchet olutch and journalled 011 said pivot, 'a seconcl shaft extencling parallel to said driving shaft, actuating links for transferring motion froni the second shaft to said ratchet sleeve, a lever in the path of said mold holder for turning said second shaft and thus moving said arm away from said pin, Whereby the pin is caused to couple the driving shaft to the-driving wheel, an extensible spring oonneoting member connected to said piston, and a cam on said driving shaft for operating said piston through said extensible member.

9. Die-oasting machine 'comprising a eruoible with an outlet for molten metal, a niold holder adapted to be nioveolby liand to said outlet, a piston for ejecting the metal through said outlet, a driving shaft, a collar fixed on said shaft and hav1ng a recess extending parallel to the shaft, a driving wheel loose on said shaft and having a recess in its hub, a coupling pin slidable in tl1e recess of the collar and positioned so as to be able t0 move into tl1e reoess in said hub, a fixecl abutment, a spring lodged in the pin and pressing against said abutment and the pin so as to urge the latter t'owards said hub, a oheek formed in said pin, an arm With a knife edge, a spring urging the arm towards said pin and normally holding ib' bet-ween said cheek and said abutment against the action of the pin aotuating spring, a pivobfor' 

